import 'package:dio/dio.dart';
import 'package:shenling_logistics/utils/Auth.dart';

class Http {
  final _dio = Dio();

  Http() {
    // 配置基础地址
    _dio.options.baseUrl = 'https://slwl-api.itheima.net';
    // 设置连接超时时间
    _dio.options.connectTimeout = const Duration(seconds: 5);
    // 设置接收超时时间
    _dio.options.receiveTimeout = const Duration(seconds: 5);
    // 设置请求头
    _dio.options.headers = {'Content-Type': 'application/json'};
    // 添加请求和响应拦截器
    _addInterceptors();
  }

  Future<dynamic> get(String url, {Map<String, dynamic>? params}) async {
    try {
      final response = await _dio.get(url, queryParameters: params);
      return handleResponse(response);
    } catch (e) {
      return handleError(e);
    }
  }

  Future<dynamic> post(String url, {Object? data}) async {
    try {
      final response = await _dio.post(url, data: data);
      return handleResponse(response);
    } catch (e) {
      return handleError(e);
    }
  }

  Future<dynamic> put(String url, {Map<String, dynamic>? params}) async {
    try {
      final response = await _dio.put(url, queryParameters: params);
      return handleResponse(response);
    } catch (e) {
      return handleError(e);
    }
  }

  // 拦截器
  void _addInterceptors() {
    _dio.interceptors
        .add(InterceptorsWrapper(onRequest: (options, handler) async {
      // 请求拦截器：添加公共请求参数、token 等
      final auth = Auth();
      String token = auth.getToken() ?? '';
      if (token.isNotEmpty) {
        options.headers['Authorization'] = token;
      }

      return handler.next(options);
    }, onResponse: (response, handler) {
      // 响应拦截器：统一处理成功响应
      return handler.next(response);
    }, onError: (DioException error, handler) {
      // 响应拦截器：统一处理错误响应
      return handler.next(error);
    }));
  }

  // 请求成功结果处理
  dynamic handleResponse(Response response) {
    if (response.statusCode! >= 200 && response.statusCode! < 300) {
      return response.data;
    } else {
      throw Exception('请求失败，状态码：${response.statusCode}');
    }
  }

  // 请求失败结果处理
  dynamic handleError(error) {
    if (error is DioException) {
      if (error.type == DioExceptionType.connectionTimeout ||
          error.type == DioExceptionType.receiveTimeout) {
        throw Exception('网络连接超时');
      } else if (error.type == DioExceptionType.badResponse) {
        throw Exception('响应错误，状态码：${error.response?.statusCode}');
      } else {
        throw Exception('网络请求错误：$error');
      }
    } else {
      throw Exception('未知错误：$error');
    }
  }
}

// 导出
final http = Http();
